On 2/8/2015 2:16 PM, Kirk Wallace wrote: > On 02/08/2015 10:11 AM, Dave Cole wrote: > ... snip >> I'm wondering why they are failing on you? >> Do you have the drives heat sinked? The back of the drives are smooth >> aluminum and are designed to be >> heatsinked to a backplane or the heatsink that Parker sold (use heat >> sink compound). >> If you break the drive to motor electrical connection while the motors >> are energized that will oftentimes kill the stepper drive. >> I would not pay $280 to have those drives repaired. Jon is right, the >> Geckos offer similar performance for less. > This may or may not apply but, I blew out some of my very old unipolar > drives recently. So far, my guess is that the problem might come about > when I power up the drives. I have a mains relay that energizes with the > e-stop button release. I think the problem is that the drives are always > enabled and are in a confused state when the power comes on. I haven't > taken the time to investigate this, but it might be worth considering. > > These drives use a relatively low frequency PWM to limit current and > make a significant amount of noise. Newer drives can use newer > technology and components to run the PWM at higher frequency. I got a > Leadshine'ish (MA860H from eBay) drive to replace one of my blown out > drives and the current limit is silent, meaning the frequency is > probably above 10kHz. I suppose young'ns may be able to here it. > > So, it might be worth making sure the drives are not enabled until the > power has stabilized. Also, as a relay opens or closes, there might be > damaging voltage spikes. Plus, power input filers are usually a good > thing to add in front of PWM type drives and VFDs to help reduce > electrical noise but may also provide some protection. > Kirk, I think this is a problem with my set-up. Every time I power up my system, I hear the steppers lock up.
Stupid question time: How would one do this? Currently I have a switched feed that feeds -->line filters--->power supplies--->drivers. Would I need to put a switch between each PS and driver? ------------------------------------------------------------------------------ Dive into the World of Parallel Programming. The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
